Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withtransitional graphical user interface showing our new design;

FIG. 2 is a front view thereof in a second state;

FIG. 3 is a front view thereof in a third state;

FIG. 4 is a front view thereof in a fourth state;

FIG. 5 is a front view thereof in a fifth state; and,

FIG. 6 is a front view thereof in a sixth state.

The outermost broken line illustrates the display screen or portionthereof and the reminder of the broken lines illustrate portions of thetransitional graphical user interface. None of the broken lines formpart of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-6. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

CLAIM We claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.